No expert here, but did a little research since this shit sounds crazy. In any case NASA believe it could be the audio equivalate of the northern lights. All of the areas where the noises have been heard have been in the direct path of recent solar bursts. The sounds people are hearing "could" be the effects on dark-matter interacting with the earth's magnetic field.
Since this is the first time in modern history we have come into a period of increase solar activity, the scientific community is really not sure what additional effects could there be on the earth. I guess we just have to wait and see.
In any case, I find all of this stuff to be extremely interesting.
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